What route did Ferdinand Magellan propose to reach the Moluccas from Spain?

Ferdinand Magellan proposed to reach the Moluccas—also known as the Spice Islands—by sailing westward from Spain.1

His objective was to provide practical proof that these islands lay within the Spanish hemisphere, as defined by the Treaty of Tordesillas, rather than the Portuguese hemisphere. To achieve this, Magellan planned to discover a navigable strait through the South American mainland (Tierra Firme) that would lead from the Atlantic Ocean to the "Sea of the South" (the Pacific Ocean), thereby avoiding the Cape of Good Hope route controlled by the Portuguese.12

This proposal was accepted by King Charles I of Spain in 1518, leading to the expedition that ultimately discovered the Strait of Magellan and completed the first circumnavigation of the globe.132